/Engine/Source/Runtime/Engine/Classes/GameFramework/PlayerController.h
Called when seamless traveling and we are being replaced by the specified PC clean up any persistent state (post process chains on LocalPlayers, for example) (not called if PlayerController is the same for the from and to GameModes)
virtual void SeamlessTravelTo ( class [APlayerController](API\Runtime\Engine\GameFramework\APlayerController) * NewPC )